The squeezing of a Ge planar quantum dot enhances the Rabi frequency of electric dipole spin
resonance by several orders of magnitude due to a strong Direct Rashba spin-orbit interaction (DR-
SOI) in such geometries [Phys. Rev. B 104, 115425 (2021)]. We investigate the geometric effect
of an elliptical (squeezed) confinement and its interplay with the polarization of driving field in
determining the Rabi frequency of a heavy-hole qubit in a planar Ge quantum dot. To calculate
the Rabi frequency, we consider only the p-linear SOIs viz. electron-like Rashba, hole-like Rashba
and hole-like Dresselhaus which are claimed to be the dominant ones by recent studies on planar
Ge heterostructures. We derive approximate analytical expressions of the Rabi frequency using a
Schrieffer-Wolff transformation for small SOI and driving strengths. Firstly, for an out-of-plane
magnetic field with magnitude B, we get an operating region with respect to B, squeezing and
polarization parameters where the qubit can be operated to obtain 'clean' Rabi flips. On and
close to the boundaries of the region, the higher orbital levels strongly interfere with the two-level
qubit subspace and destroy the Rabi oscillations, thereby putting a limitation on squeezing of the
confinement. The Rabi frequency shows different behaviour for electron-like and hole-like Rashba
SOIs. It vanishes for right (left) circular polarization in presence of purely electron-like (hole-
like) Rashba SOI in a circular confinement. For both in- and out-of-plane magnetic fields, higher
Rabi frequencies are achieved for squeezed configurations when the ellipses of polarization and the
confinement equipotential have their major axes aligned but with different eccentricities. We also
deduce a simple formula to calculate the effective heavy hole mass by measuring the Rabi frequencies
using this setup.